The magical preserve Fablehaven provides refuge to numerous mystical species: centaurs, trolls, satyrs, ogres, fairies, minotaurs, brownies, imps, nymphs, and many others. But some beings are too large and powerful to be confined to regular enchanted refuges. These mightiest of creatures dwell inside the dragon sanctuaries. Two hidden artifacts have been found. More preserves face destruction as the Society of the Evening Star relentlessly pursues new talismans. Desperate to stop them, Kendra discovers the location of the key to a vault housing one of the artifacts in Patton's Journal of Secrets. To retrieve the key, the Knights of the Dawn must enter a death trap — a dragon sanctuary called Wyrmroost.